EP1390559A1 - Frequenzabgleich für bulk-acoustic-wave resonatoren durch lokales ionenstrahlätzen - Google Patents
Frequenzabgleich für bulk-acoustic-wave resonatoren durch lokales ionenstrahlätzenInfo
- Publication number
- EP1390559A1 EP1390559A1 EP01962685A EP01962685A EP1390559A1 EP 1390559 A1 EP1390559 A1 EP 1390559A1 EP 01962685 A EP01962685 A EP 01962685A EP 01962685 A EP01962685 A EP 01962685A EP 1390559 A1 EP1390559 A1 EP 1390559A1
- Authority
- EP
- European Patent Office
- Prior art keywords
- layer
- ion beam
- profile
- thickness profile
- guided
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Granted
Links
- 238000004519 manufacturing process Methods 0.000 title claims abstract description 7
- 238000000034 method Methods 0.000 claims abstract description 38
- 238000010884 ion-beam technique Methods 0.000 claims abstract description 23
- 239000000758 substrate Substances 0.000 claims abstract description 4
- 238000005530 etching Methods 0.000 claims description 8
- 239000004922 lacquer Substances 0.000 claims description 3
- XKRFYHLGVUSROY-UHFFFAOYSA-N Argon Chemical compound [Ar] XKRFYHLGVUSROY-UHFFFAOYSA-N 0.000 claims 2
- 238000009826 distribution Methods 0.000 claims 2
- 229910052786 argon Inorganic materials 0.000 claims 1
- 239000003990 capacitor Substances 0.000 claims 1
- 238000005259 measurement Methods 0.000 claims 1
- 239000012528 membrane Substances 0.000 claims 1
- 229910052751 metal Inorganic materials 0.000 description 5
- 239000002184 metal Substances 0.000 description 5
- 230000008901 benefit Effects 0.000 description 4
- 238000000151 deposition Methods 0.000 description 2
- 230000008021 deposition Effects 0.000 description 2
- 238000004544 sputter deposition Methods 0.000 description 2
- 101000798993 Pseudomonas putida (strain ATCC 700007 / DSM 6899 / BCRC 17059 / F1) 2-hydroxy-6-oxo-2,4-heptadienoate hydrolase Proteins 0.000 description 1
- 239000000919 ceramic Substances 0.000 description 1
- 230000001419 dependent effect Effects 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 230000009897 systematic effect Effects 0.000 description 1
- WFKWXMTUELFFGS-UHFFFAOYSA-N tungsten Chemical compound [W] WFKWXMTUELFFGS-UHFFFAOYSA-N 0.000 description 1
- 229910052721 tungsten Inorganic materials 0.000 description 1
- 239000010937 tungsten Substances 0.000 description 1
Classifications
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01J—ELECTRIC DISCHARGE TUBES OR DISCHARGE LAMPS
- H01J37/00—Discharge tubes with provision for introducing objects or material to be exposed to the discharge, e.g. for the purpose of examination or processing thereof
- H01J37/30—Electron-beam or ion-beam tubes for localised treatment of objects
- H01J37/305—Electron-beam or ion-beam tubes for localised treatment of objects for casting, melting, evaporating or etching
-
- C—CHEMISTRY; METALLURGY
- C23—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; CHEMICAL SURFACE TREATMENT; DIFFUSION TREATMENT OF METALLIC MATERIAL; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL; INHIBITING CORROSION OF METALLIC MATERIAL OR INCRUSTATION IN GENERAL
- C23C—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; SURFACE TREATMENT OF METALLIC MATERIAL BY DIFFUSION INTO THE SURFACE, BY CHEMICAL CONVERSION OR SUBSTITUTION; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL
- C23C14/00—Coating by vacuum evaporation, by sputtering or by ion implantation of the coating forming material
- C23C14/58—After-treatment
- C23C14/5826—Treatment with charged particles
- C23C14/5833—Ion beam bombardment
-
- C—CHEMISTRY; METALLURGY
- C23—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; CHEMICAL SURFACE TREATMENT; DIFFUSION TREATMENT OF METALLIC MATERIAL; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL; INHIBITING CORROSION OF METALLIC MATERIAL OR INCRUSTATION IN GENERAL
- C23C—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; SURFACE TREATMENT OF METALLIC MATERIAL BY DIFFUSION INTO THE SURFACE, BY CHEMICAL CONVERSION OR SUBSTITUTION; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL
- C23C14/00—Coating by vacuum evaporation, by sputtering or by ion implantation of the coating forming material
- C23C14/58—After-treatment
-
- C—CHEMISTRY; METALLURGY
- C23—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; CHEMICAL SURFACE TREATMENT; DIFFUSION TREATMENT OF METALLIC MATERIAL; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL; INHIBITING CORROSION OF METALLIC MATERIAL OR INCRUSTATION IN GENERAL
- C23C—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; SURFACE TREATMENT OF METALLIC MATERIAL BY DIFFUSION INTO THE SURFACE, BY CHEMICAL CONVERSION OR SUBSTITUTION; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL
- C23C14/00—Coating by vacuum evaporation, by sputtering or by ion implantation of the coating forming material
- C23C14/58—After-treatment
- C23C14/5873—Removal of material
-
- C—CHEMISTRY; METALLURGY
- C23—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; CHEMICAL SURFACE TREATMENT; DIFFUSION TREATMENT OF METALLIC MATERIAL; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL; INHIBITING CORROSION OF METALLIC MATERIAL OR INCRUSTATION IN GENERAL
- C23C—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; SURFACE TREATMENT OF METALLIC MATERIAL BY DIFFUSION INTO THE SURFACE, BY CHEMICAL CONVERSION OR SUBSTITUTION; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL
- C23C16/00—Chemical coating by decomposition of gaseous compounds, without leaving reaction products of surface material in the coating, i.e. chemical vapour deposition [CVD] processes
- C23C16/56—After-treatment
-
- C—CHEMISTRY; METALLURGY
- C23—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; CHEMICAL SURFACE TREATMENT; DIFFUSION TREATMENT OF METALLIC MATERIAL; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL; INHIBITING CORROSION OF METALLIC MATERIAL OR INCRUSTATION IN GENERAL
- C23F—NON-MECHANICAL REMOVAL OF METALLIC MATERIAL FROM SURFACE; INHIBITING CORROSION OF METALLIC MATERIAL OR INCRUSTATION IN GENERAL; MULTI-STEP PROCESSES FOR SURFACE TREATMENT OF METALLIC MATERIAL INVOLVING AT LEAST ONE PROCESS PROVIDED FOR IN CLASS C23 AND AT LEAST ONE PROCESS COVERED BY SUBCLASS C21D OR C22F OR CLASS C25
- C23F4/00—Processes for removing metallic material from surfaces, not provided for in group C23F1/00 or C23F3/00
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01C—RESISTORS
- H01C17/00—Apparatus or processes specially adapted for manufacturing resistors
- H01C17/22—Apparatus or processes specially adapted for manufacturing resistors adapted for trimming
- H01C17/24—Apparatus or processes specially adapted for manufacturing resistors adapted for trimming by removing or adding resistive material
- H01C17/2404—Apparatus or processes specially adapted for manufacturing resistors adapted for trimming by removing or adding resistive material by charged particle impact, e.g. by electron or ion beam milling, sputtering, plasma etching
-
- H—ELECTRICITY
- H03—ELECTRONIC CIRCUITRY
- H03H—IMPEDANCE NETWORKS, e.g. RESONANT CIRCUITS; RESONATORS
- H03H3/00—Apparatus or processes specially adapted for the manufacture of impedance networks, resonating circuits, resonators
- H03H3/007—Apparatus or processes specially adapted for the manufacture of impedance networks, resonating circuits, resonators for the manufacture of electromechanical resonators or networks
- H03H3/02—Apparatus or processes specially adapted for the manufacture of impedance networks, resonating circuits, resonators for the manufacture of electromechanical resonators or networks for the manufacture of piezoelectric or electrostrictive resonators or networks
- H03H3/04—Apparatus or processes specially adapted for the manufacture of impedance networks, resonating circuits, resonators for the manufacture of electromechanical resonators or networks for the manufacture of piezoelectric or electrostrictive resonators or networks for obtaining desired frequency or temperature coefficient
-
- H—ELECTRICITY
- H03—ELECTRONIC CIRCUITRY
- H03H—IMPEDANCE NETWORKS, e.g. RESONANT CIRCUITS; RESONATORS
- H03H3/00—Apparatus or processes specially adapted for the manufacture of impedance networks, resonating circuits, resonators
- H03H3/007—Apparatus or processes specially adapted for the manufacture of impedance networks, resonating circuits, resonators for the manufacture of electromechanical resonators or networks
- H03H3/02—Apparatus or processes specially adapted for the manufacture of impedance networks, resonating circuits, resonators for the manufacture of electromechanical resonators or networks for the manufacture of piezoelectric or electrostrictive resonators or networks
- H03H3/04—Apparatus or processes specially adapted for the manufacture of impedance networks, resonating circuits, resonators for the manufacture of electromechanical resonators or networks for the manufacture of piezoelectric or electrostrictive resonators or networks for obtaining desired frequency or temperature coefficient
- H03H2003/0414—Resonance frequency
Definitions
- CD cn SD ö co T3 S "cn cn? C ⁇ DM ⁇ tr ö cn ⁇ - • o C ⁇ ö ⁇ t. O ⁇ H- rt P- • ⁇ O 0 n * ⁇ H- CD CD CD CD CD cn ⁇ - ⁇ d 0 CD
- CD SD d »3 t. CD ⁇ P- 0. ⁇ cn H, CD CD rt d CD • fl 3 CD ⁇ . 3 d 3 3 SD 3 0 nd CD M tr o »H 1 t. ⁇ - 3 3 H LQ
- the present invention is therefore based on the object of providing a method for producing a layer with a locally adapted or predetermined layer thickness profile which reduces or completely avoids the difficulties mentioned.
- the object of the present invention is to provide a method which can be used to set the natural frequencies of piezoelectric resonant circuits.
- At least one ion beam is guided over the layer at least once, so that a local etching of the layer takes place at the location of the ion beam in accordance with the removal profile and a layer is produced with a locally adapted or predetermined layer thickness profile.
- the method according to the invention has the advantage that both random fluctuations from wafer to wafer and systematic fluctuations between the center of the wafer and the edge of the wafer can be corrected.
- the method according to the invention allows a cost-efficient correction of these fluctuations with comparatively simple equipment.
- the method according to the invention can be used to produce layers with areas of different thickness.
- the method according to the invention has the additional advantage that it can be used universally for any layer materials and layer thicknesses.
- the method according to the invention can be used several times if the removal profile could not be achieved in the first attempt.
- N tr SD ⁇ CD ⁇ - ⁇ tr P- ⁇ rt ⁇ sx ⁇ ⁇ ⁇ tr N 3 cn rt ⁇ ⁇ tr Mi SD dz N rt P- Mi ⁇ P- cn 0 d tr SD CO M rt d SD P 3 3 0 ⁇
- FIGS. 7-8 a further embodiment of the method according to the invention.
- this layer structure typically has a thickness of approximately 5 ⁇ m.
- other acoustically insulating substructures such as acoustic mirrors, can also be used.
- the upper electrode layer 7 was produced with a locally adapted thickness profile. In the present example, this means that the upper electrode layer 7 in the region of the piezoelectric resonant circuit directly above the piezo layer 6 is made significantly thinner than in the other regions.
- the thickness profile of the upper electrode layer 7 shown in FIG. 1 was generated in accordance with a method according to the invention.
- FIGS. 2 to 4 show an embodiment of the method according to the invention using the example of the piezoelectric resonator shown in FIG. 1.
- the starting point is the structure shown in FIG. 2, which corresponds to a piezoelectric resonant circuit without an upper electrode layer 7.
- the structure shown in FIG. 2 thus acts as a type of substrate for the subsequent deposition of the upper electrode layer 7.
- a relatively thick metal layer for example a tungsten layer, is then produced by a sputtering process.
- a sputtering process instead of a sputtering process, a CVD process or an electrochemical process can also be used.
- the removal profile for the metal is determined. In the present example, this determination is made at the location of the resonant circuit by measuring the natural frequency of the resonant circuit.
- N SD ⁇ P ⁇ - ⁇ PX o X dd P P- co ⁇ ⁇ X o • * ⁇ ⁇ - d rt 3 rt LQ z 3 ⁇ d ⁇ 0 LQ 3 P- 0 'P 3 ⁇ ⁇ tr 3 ⁇ 3 P rt o P ⁇ P ⁇ 'Tl ⁇ ⁇ ⁇ ⁇ Ml ⁇ Ul ⁇ 3 ⁇ SX 3 P ⁇ tr LQ ⁇ s.
Landscapes
- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Materials Engineering (AREA)
- Mechanical Engineering (AREA)
- Metallurgy (AREA)
- Organic Chemistry (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Manufacturing & Machinery (AREA)
- Plasma & Fusion (AREA)
- Physics & Mathematics (AREA)
- Microelectronics & Electronic Packaging (AREA)
- General Chemical & Material Sciences (AREA)
- Analytical Chemistry (AREA)
- Drying Of Semiconductors (AREA)
- Piezo-Electric Or Mechanical Vibrators, Or Delay Or Filter Circuits (AREA)
- Powder Metallurgy (AREA)
Abstract
Description
Claims
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
EP07008531A EP1816233B1 (de) | 2001-05-22 | 2001-05-22 | Verfahren zur Herstellung einer Schicht mit einem vorgegebenen Schichtdickenprofil |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
PCT/EP2001/005889 WO2002095085A1 (de) | 2001-05-22 | 2001-05-22 | Frequenzabgleich für bulk-acoustic-wave resonatoren durch lokales ionenstrahlätzen |
Related Child Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP07008531A Division EP1816233B1 (de) | 2001-05-22 | 2001-05-22 | Verfahren zur Herstellung einer Schicht mit einem vorgegebenen Schichtdickenprofil |
Publications (2)
Publication Number | Publication Date |
---|---|
EP1390559A1 true EP1390559A1 (de) | 2004-02-25 |
EP1390559B1 EP1390559B1 (de) | 2007-09-05 |
Family
ID=8164429
Family Applications (2)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP01962685A Expired - Lifetime EP1390559B1 (de) | 2001-05-22 | 2001-05-22 | Verfahren zur herstellung einer schicht mit einem vordefinierten schichtdickenprofil |
EP07008531A Expired - Lifetime EP1816233B1 (de) | 2001-05-22 | 2001-05-22 | Verfahren zur Herstellung einer Schicht mit einem vorgegebenen Schichtdickenprofil |
Family Applications After (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP07008531A Expired - Lifetime EP1816233B1 (de) | 2001-05-22 | 2001-05-22 | Verfahren zur Herstellung einer Schicht mit einem vorgegebenen Schichtdickenprofil |
Country Status (6)
Country | Link |
---|---|
US (1) | US20040212459A1 (de) |
EP (2) | EP1390559B1 (de) |
JP (1) | JP2004527972A (de) |
KR (1) | KR20040005977A (de) |
DE (2) | DE50114591D1 (de) |
WO (1) | WO2002095085A1 (de) |
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE102004054895B4 (de) * | 2004-11-12 | 2007-04-19 | Infineon Technologies Ag | Dünnschicht-BAW-Filter sowie Verfahren zur Herstellung eines Dünnschicht-BAW-Filters |
Families Citing this family (5)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JP2008098528A (ja) * | 2006-10-13 | 2008-04-24 | Toshiba Corp | 半導体装置の製造方法 |
US7535324B2 (en) | 2007-06-15 | 2009-05-19 | Avago Technologies Wireless Ip, Pte. Ltd. | Piezoelectric resonator structure and method for manufacturing a coupled resonator device |
FR2941878B1 (fr) * | 2009-02-10 | 2011-05-06 | Quertech Ingenierie | Procede de traitement par un faisceau d'ions d'une couche metallique deposee sur un substrat |
US8479363B2 (en) * | 2010-05-11 | 2013-07-09 | Hao Zhang | Methods for wafer level trimming of acoustically coupled resonator filter |
JP6719178B2 (ja) * | 2015-05-22 | 2020-07-08 | エスアイアイ・クリスタルテクノロジー株式会社 | 圧電振動片の製造方法及び圧電振動子の製造方法 |
Family Cites Families (20)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US2877338A (en) * | 1954-10-22 | 1959-03-10 | James Knights Company | Method of adjusting the operating frequency of sealed piezoelectric crystals |
US3699334A (en) * | 1969-06-16 | 1972-10-17 | Kollsman Instr Corp | Apparatus using a beam of positive ions for controlled erosion of surfaces |
FR2354617A1 (fr) * | 1976-06-08 | 1978-01-06 | Electro Resistance | Procede pour la fabrication de resistances electriques a partir de feuilles ou de films metalliques et resistances obtenues |
JPS58106750A (ja) * | 1981-12-18 | 1983-06-25 | Toshiba Corp | フオ−カスイオンビ−ム加工方法 |
JPS6042832A (ja) * | 1983-08-18 | 1985-03-07 | Matsushita Electric Ind Co Ltd | イオンビ−ム装置 |
JPS61137327A (ja) * | 1984-12-10 | 1986-06-25 | Nec Corp | 層間絶縁膜のエツチング方法 |
CA1252581A (en) * | 1985-05-28 | 1989-04-11 | Yoshinobu Aoyagi | Electron beam-excited ion beam source |
JP2713923B2 (ja) * | 1987-10-07 | 1998-02-16 | 株式会社日立製作所 | 集束イオンビームを用いたデバイス加工方法 |
JPH04196610A (ja) * | 1990-11-26 | 1992-07-16 | Seiko Epson Corp | 圧電振動子の周波数調整方法 |
US5266529A (en) * | 1991-10-21 | 1993-11-30 | Trw Inc. | Focused ion beam for thin film resistor trim on aluminum nitride substrates |
JPH0773834A (ja) * | 1993-08-31 | 1995-03-17 | Nippon Steel Corp | 透過電子顕微鏡用薄膜試料作製方法 |
US5876860A (en) * | 1997-12-09 | 1999-03-02 | N.V. Interturbine | Thermal barrier coating ceramic structure |
JP3473538B2 (ja) * | 1999-05-14 | 2003-12-08 | 株式会社村田製作所 | 圧電部品の周波数調整装置及び周波数調整方法 |
US6529311B1 (en) * | 1999-10-28 | 2003-03-04 | The Trustees Of Boston University | MEMS-based spatial-light modulator with integrated electronics |
US6307447B1 (en) * | 1999-11-01 | 2001-10-23 | Agere Systems Guardian Corp. | Tuning mechanical resonators for electrical filter |
WO2002005315A2 (en) * | 2000-07-10 | 2002-01-17 | Epion Corporation | System and method for improving thin films by gas cluster ion be am processing |
US6456173B1 (en) * | 2001-02-15 | 2002-09-24 | Nokia Mobile Phones Ltd. | Method and system for wafer-level tuning of bulk acoustic wave resonators and filters |
US6456011B1 (en) * | 2001-02-23 | 2002-09-24 | Front Range Fakel, Inc. | Magnetic field for small closed-drift ion source |
US6874211B2 (en) * | 2001-03-05 | 2005-04-05 | Agilent Technologies, Inc. | Method for producing thin film bulk acoustic resonators (FBARs) with different frequencies on the same substrate by subtracting method and apparatus embodying the method |
US6441702B1 (en) * | 2001-04-27 | 2002-08-27 | Nokia Mobile Phones Ltd. | Method and system for wafer-level tuning of bulk acoustic wave resonators and filters |
-
2001
- 2001-05-22 US US10/478,751 patent/US20040212459A1/en not_active Abandoned
- 2001-05-22 DE DE50114591T patent/DE50114591D1/de not_active Expired - Lifetime
- 2001-05-22 KR KR10-2003-7015186A patent/KR20040005977A/ko not_active Application Discontinuation
- 2001-05-22 JP JP2002591547A patent/JP2004527972A/ja active Pending
- 2001-05-22 EP EP01962685A patent/EP1390559B1/de not_active Expired - Lifetime
- 2001-05-22 WO PCT/EP2001/005889 patent/WO2002095085A1/de active IP Right Grant
- 2001-05-22 DE DE50112976T patent/DE50112976D1/de not_active Expired - Lifetime
- 2001-05-22 EP EP07008531A patent/EP1816233B1/de not_active Expired - Lifetime
Non-Patent Citations (1)
Title |
---|
See references of WO02095085A1 * |
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE102004054895B4 (de) * | 2004-11-12 | 2007-04-19 | Infineon Technologies Ag | Dünnschicht-BAW-Filter sowie Verfahren zur Herstellung eines Dünnschicht-BAW-Filters |
Also Published As
Publication number | Publication date |
---|---|
EP1816233A2 (de) | 2007-08-08 |
JP2004527972A (ja) | 2004-09-09 |
DE50112976D1 (de) | 2007-10-18 |
KR20040005977A (ko) | 2004-01-16 |
WO2002095085A1 (de) | 2002-11-28 |
EP1390559B1 (de) | 2007-09-05 |
DE50114591D1 (de) | 2009-01-29 |
EP1816233B1 (de) | 2008-12-17 |
WO2002095085A8 (de) | 2002-12-19 |
EP1816233A3 (de) | 2007-08-22 |
US20040212459A1 (en) | 2004-10-28 |
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Inventor name: TIMME, HANS-JOERG Inventor name: ELBRECHT, LUEDER Inventor name: NESSLER, WINFRIED Inventor name: MARKSTEINER, STEPHAN Inventor name: AIGNER, ROBERT |
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